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J. M. MILLER, 0F NEW YORK, N. Y.`

Letters .Patent NQ. 60,222, dated December 4, 1866.

E' SPECIFICATIN. l

Be it known that I, JAMES M. MILLER, of the city, county, andi, State of New York, have invented certain new and useful Improvements in Steam Apparatus for transferring the waste heat from the exhaust of a steam, ,i engine back to the boiler g and I do hereby declare and ascertainmy said invention asfollows, referring to l the accompanying drawings, in which-'- i Figure 1 is a vertical section through the apparatus.

Figure 2 is a vertical section on line w w of iig. 1. Figure 3 is a side elevation of the apparatus. Figure 4 is a horizontal section on the line :1: :r of iig. l. Figure 5 is a horizontal section on the line :j y of iig. I. VFigure 6 is a horizontal sectionon'the line z z of iig. 1. Figure 7 shows the legs o, on casting a. Figure 8 is an enlarged ViewY of one ofthe tubes b. The purpose of this invention is to more perfectly transfer the waste heat from the engine back' to the steam boiler, with the least amount of power available, and to relieve the case containing the condensing Aand feed-water of pressure, by means of which I can make the tubes andother parts thin and at less cost than could otherwise be done, while I increase the el'liciency of the apparatus, and produce a large economy of fuel. n w The construction is as follows a a represent oblong hollow castings,with parallel sides, the form of which t is clearly seen in gs. 1, 2, and 4. The two broad sides of these 4castings are pierced with holes as indicated by the circles b b, iig. 2, and there are braces, ce, in the interior (see iig. I) to stay the sides and ,prevent ,their collapsing; Two legs d, iig; 7, are cast on to the lower corners, on which the casting4 a stands. The holes above` named in thecasting a, are threaded to receive the ends of .certain tubes b that are screwed into them g these tubes are of peculiar construction, `as shown at iig. 8, in section, where it will be `noticed the tube is made of,

very thin metal, with its 'closed end recurvedinward, so .as to form an annular-chamber that communicates with" the interior of: the casting a, when 'thel tube'b is connected therewith. t The end of the tube b that is screwed into the casting is made thick, the thickness projecting inward, sp as to contract the opening into the chamber of the casting a. By this construction, a small quantity of condensed water is retained in the tube, which I deem` advantageous. The proper number of. tubes having been screwed into thecasting or `centre chamber a, `perpei:

i dicular to its broad side, when the said casting stands erect in the inclosing case, they will be in a horizontal be, position, as clearly seen in iig. 1. Any desired number of such chambers are placed in an inclosing water-tight case e, the legs d being aiixed to the base-plate f thereof. y rlvwol such chambers are shown in the drawing, and these chambers have no connection or communication with the said casee. The chambers a connect at the top with the exhaustpipe, g, of the steam -engine through which the exhaust steam passesinto them. Aat the bottom of these chambers a, are openings that discharge the contents thereof into 'coils of pipe` 71. Located between the said chambers a and the'bottom of the case, one or morecoils are used'for each section `or chamber a, and they all termnatelin a centre chamber From the under side f chamber z', below the base-plate f, there is a second series of coilsI of pipe, It, conveying the discharged and condensed steaml to the vacuum puinp l, which pumps it into the case e, that surrounds the tube chambers a b, and which is filled withpurc hot lwater, which is thence causedto iiow through the pipe m;to thefeed pump n, that forces it into'lthe boiler. The coils of pipe lo below 4the base-platef are enclosed in a cold-water tank, which receives its supply of cold water from any convenient source. The case e should be supplied with a safety-valve to guard against u ndue pressure, which is, however,

in all ordinary cases, kept down properly by the feed pump n, interposed between it and the boiler, and feeds it with pure highly heated water from the said case e, by which a large economy of heat is,`ei ifected,`and lightness ofV construction of case ev and tubes b attained'. l i

I Having thus fully described my `invention and its purposes, what I` claim therein as new, 4:and for which I r desire Letters Patent, is t t t n 1. The combination of apparatusfo'r transferring the water of condensation to the boiler, highly heated,

by passing it through the case containing the condenser, said apparatus consisting of the vacuun pump, casete, and pump n that forces the water from the case e into the boiler, substantially as and forthe purposes set forth.

I also claim arranging the coils of pipe L within thecase e, above the base-platef, and in. combination with` the chambers a-as specified.

I also claim the conjoint arrangement of pipes h' and pipes 7c, substantially as herein described.

vI also claim the'combination of the chambers a b, case e, vacuum and feed pumps l and n', arranged and combined substantially as and for the purposes herein made known. l J. M. `MILLER.

Witnesses:

S. Gr. CLARKE, ALBERT H.'HooK. 

